rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4869/1:b..l
(detected by 1, t=10502 jiffies, g=168245, q=20)
task:kworker/u4:7 state:R running task stack:22168 pid:27678 ppid: 2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:4683 [inline]
__schedule+0xc07/0x11f0 kernel/sched/core.c:5940
preempt_schedule_irq+0xe3/0x190 kernel/sched/core.c:6328
irqentry_exit+0x56/0x90 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x1e7/0x4a0 kernel/locking/lockdep.c:5629
Code: 08 48 89 df e8 0a 65 67 00 f6 84 24 81 00 00 00 02 0f 85 24 02 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2c 00 00 00 00 43 c7 44 2c 09 00 00 00 00 43 c7 44 2c 11
RSP: 0018:ffffc90002a6f8e0 EFLAGS: 00000206
RAX: 1ffff9200054df2c RBX: ffffc90002a6f960 RCX: ffffffff816213c5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002a6fa40 R08: dffffc0000000000 R09: fffffbfff1f5dfb1
R10: fffffbfff1f5dfb1 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff9200054df24 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267
rcu_read_lock include/linux/rcupdate.h:687 [inline]
inet_twsk_purge+0x11b/0x890 net/ipv4/inet_timewait_sock.c:268
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x7ec/0xc60 net/core/net_namespace.c:595
process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
worker_thread+0xac1/0x1320 kernel/workqueue.c:2422
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
task:systemd-udevd state:R running task stack:19280 pid: 4869 ppid: 1 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4683 [inline]
__schedule+0xc07/0x11f0 kernel/sched/core.c:5940
preempt_schedule_irq+0xe3/0x190 kernel/sched/core.c:6328
irqentry_exit+0x56/0x90 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x1e7/0x4a0 kernel/locking/lockdep.c:5629
Code: 08 48 89 df e8 0a 65 67 00 f6 84 24 81 00 00 00 02 0f 85 24 02 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2c 00 00 00 00 43 c7 44 2c 09 00 00 00 00 43 c7 44 2c 11
RSP: 0018:ffffc9000160f2a0 EFLAGS: 00000206
RAX: 1ffff920002c1e64 RBX: ffffc9000160f320 RCX: ffffffff816213c5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000160f3f8 R08: dffffc0000000000 R09: fffffbfff1f5dfb1
R10: fffffbfff1f5dfb1 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920002c1e5c R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267
rcu_read_lock include/linux/rcupdate.h:687 [inline]
is_bpf_text_address+0x27/0x270 kernel/bpf/core.c:704
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x93/0x100 kernel/extable.c:105
unwind_get_return_address+0x48/0x80 arch/x86/kernel/unwind_orc.c:318
arch_stack_walk+0x98/0xe0 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x104/0x1e0 kernel/stacktrace.c:121
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x3d/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1625 [inline]
slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650
slab_free mm/slub.c:3210 [inline]
kfree+0xcf/0x2d0 mm/slub.c:4262
tomoyo_path_perm+0x4e5/0x650 security/tomoyo/file.c:842
security_inode_getattr+0xc0/0x140 security/security.c:1332
vfs_getattr fs/stat.c:139 [inline]
vfs_statx+0x188/0x3d0 fs/stat.c:207
vfs_fstatat fs/stat.c:225 [inline]
vfs_lstat include/linux/fs.h:3386 [inline]
__do_sys_newlstat fs/stat.c:380 [inline]
__se_sys_newlstat+0xab/0x770 fs/stat.c:374
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0e047d0335
RSP: 002b:00007fff5c8de028 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055c3c9c1ab40 RCX: 00007f0e047d0335
RDX: 00007fff5c8de060 RSI: 00007fff5c8de060 RDI: 000055c3c9c19b40
RBP: 00007fff5c8de120 R08: 00007f0e04a8f228 R09: 0000000000001010
R10: 00007f0e04a8eb58 R11: 0000000000000246 R12: 000055c3c9c19b40
R13: 000055c3c9c19b44 R14: 000055c3c9c256f1 R15: 000055c3c9c256f4
rcu: rcu_preempt kthread starved for 10498 jiffies! g168245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:26384 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4683 [inline]
__schedule+0xc07/0x11f0 kernel/sched/core.c:5940
schedule+0x14b/0x210 kernel/sched/core.c:6019
schedule_timeout+0x1aa/0x2f0 kernel/time/timer.c:1878
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0x10fd/0x1720 kernel/rcu/tree.c:2169
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 199 Comm: kworker/u4:5 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105
nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation+0x200/0x270 kernel/rcu/tree_stall.h:479
print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2297/0x2a30 kernel/rcu/tree.c:2641
update_process_times+0x197/0x200 kernel/time/timer.c:1782
tick_sched_handle kernel/time/tick-sched.c:226 [inline]
tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xaaa/0xd60 kernel/smp.c:967
Code: 9c 0b 00 eb 50 66 66 2e 0f 1f 84 00 00 00 00 00 f3 90 42 0f b6 04 3b 84 c0 75 11 41 f7 45 00 01 00 00 00 74 2b e8 e6 9b 0b 00 e4 44 89 e9 80 e1 07 80 c1 03 38 c1 7c e2 4c 89 ef e8 8f da 54
RSP: 0018:ffffc900017ef820 EFLAGS: 00000293
RAX: ffffffff8174862a RBX: 1ffff1101738b05d RCX: ffff888013dab880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900017ef960 R08: ffffffff817485ee R09: ffffffff842a0de0
R10: 0000000000000009 R11: ffff888013dab880 R12: 0000000000000000
R13: ffff8880b9c582e8 R14: 1ffff110173aa4a8 R15: dffffc0000000000
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1133
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:929 [inline]
text_poke_bp_batch+0x310/0x940 arch/x86/kernel/alternative.c:1114
text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:145
static_key_enable_cpuslocked+0x12d/0x250 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate+0xbf/0x440 mm/kfence/core.c:623
process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
worker_thread+0xac1/0x1320 kernel/workqueue.c:2422
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295